/Engine/Source/Runtime/MeshDescription/Public/MeshDescription.h
Return adjacent triangles into aTArraywith the specified allocator
template<typename Alloc> [TArray](API\Runtime\Core\Containers\TArray)< [FTriangleID](API\Runtime\MeshDescription\FTriangleID), Alloc > GetTriangleAdjacentTriangles ( const [FTriangleID](API\Runtime\MeshDescription\FTriangleID) TriangleID ) const